Service difficulty report · Support · Boeing 7377H4

Difficulty date
September 29, 2022
Submitted
October 17, 2022
Operation
Air carrier
Aircraft
N266WN
Make and model
Boeing 7377H4
Aircraft serial
32523
Aircraft time
52,718 hours, 31,500 cycles
Part
Support
Condition
Corroded
Location
Fwd Cargo
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

CORROSION ON FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT FROM STA 500A TO STA 500C+10; RBL 23 TO 25; WL 157. / [01] BLENDED CORROSION ON FWD CARGO BAY FLOOR TO SIDEWALL SUPPORT ; WORK AREA BS 500A+2 ; L 1.0' X W 1.0' X D 0.010' ; BS 500A+6 ; L 1.0' X W 1.0' X D 0.006'; BS 500A+7; L 0.5' X W 0.5' X D 0.007' ; BS 500A+10; L 1.0' X W 1.0' X D 0.007' ; BS 500A+12 ; L 1.0' X W 1.0' X D 0.006 ; BS 500A+14; L 0.5' X W 0.5' X D 0.010' ; BS 500A+15; L 0.5' X W 0.5' X D 0.010' ; BS 500A+16; L 1.0' X W 1.0' X W 0.008 ; BS 500B+1; L 0.5' X W 0.5' X D 0.007' ; BS 500B+2; L 1.0' X W 1.0' X D 0.008' ; BS 500B+6; L 1.0' X W 1.0' X D 0.009; BS 500B+14 ; L 1.0' X W 1.0' X D 0.005' ; BS 500B+18; L .5' X W 0.5' X D 0.007 ; BS 500B+19; L 1.0' X W 1.0' X D 0.007' ; BS 500C+2; L 1.0' X W 1.0' X D 0.007' ; BS 500C+4; L 1.0' X W 1.0' X D 0.008 ; BS 500C+6; L 1.0' X W 1.0' X D 0.007' ; BS 500C+9; L 0.5' X W 0.5' X D 0.007' ;BS 500C+10; L 1.0' X W 1.0' X D 0.007' FOUND TO BE OUT OF LIMITS IAW SRM 53-00-53-1A-2 ; USED DEPTH GAGE ; ID:ATS2473 ; S/N: UNKNOWN ; DUE: 08/2023;[02] SRM 53-00-53-1A-2 IS APPLICABLE FOR THIS;[03] VERIFIED CORRECTIVE ACTION #1 AND 2;[04] LOCATED AND DRILLED NEW FCB FLOOR TO SIDEWALL SUPPORT FROM BS 500A-500D; RBL 25; WL 157 FROM BAC1496-444#7075T62 LOT#1501239-1. APPLIED CHEMICAL CONVERSION COATING IAW SRM 51-40-05; SOPM 20-43-03; BOEING DWG 143A7505 AND BOEING DWG 143A7500. OK TO APPLY PRIMER;

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